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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9feca631e4af4b64313cec5136db9218217afe4d3560d0bd1a3c7e01fa289d' 
  AND token = 'w6lmHBo6I1nWqP6zla68Umg5T3yYXjSF1uGCM5Dg+t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}